atcomsystems.ca/forum Forums TDM Business Telephone Systems Avaya - Lucent Telephones & Systems how to change trunk priority of AVAYA IPO 500?

One AVAYA IPO 500 system with both ISDN and PSTN trunks.
When calling out, system will select ISDN and PSTN trunk alternately.

But customer want to pick up PSTN lines first, if PSTN is busy, then pick up ISDN lines.

I am not sure how to change the trunk priority when calling out.

Any help?

Put them in different Outgoing Groups, then make a separate ARS table to use each group, point 9N shortcode to the ARS that uses the PSTN group, have that overflow to the ISDN group.

Thank you, Tommy!

The main idea is just as what I think, so I should put PSTN lines in outgoing group 0, ISDN lines in outgoing group 1.

Create another ARS "51: ISDN routing", and change Alternate Route of "50:Main" into "51: ISDN routing". Is that right?

And the coming question is that whether Alternate Route Priority Level and Alternate Route Wait Time (30s) should be changed?

2nd question is that system have 4 Analogue ports but just 1 PSTN line is connected. Should I disable the other 3 ports or put them into another outgoing group?
(In NEC phone system analogue trunks no in use should be disabled, otherwise system will pick up these trunks not exist, and get busy tone.)

Sorry about so many questions as I have no demo system to test it.

Rename 50-Main to Analog. Copy and Paste. Rename the new 51 route ISDN. Change the line group ID for 51-ISDN from 0 to 1. Set the Alternate Route for 50 to 51. Don't change the Route Priority or Wait Time.

Change the outgoing group for the ISDN channels to 1. Keep the outgoing group for the working Analog lines at 0. Put the unused analog lines out of service, and for good measure change their outgoing group to something other than 0 or 1 (I use 2 for line 2, 3 for line 3, 4 for line 4).

Thank a lot, Tommy!